Look down the board and you'll find a forum on "storage/cellars/racking". That's where you'll find discussions of storage units.

There are all sorts available, and you can spend as much as you wish. My first one was from Haier (China), for which I paid about $300 at Sam's Club; it's still going strong, although I've since augmented it with other facilities. Some features offered by some vendors include stainless steel surface, dual or even triple temperature zones, solid or shaded glass door, sliding shelves versus wire racks, humidity control (rare in a small unit)..... the list goes on. Suggest for your first unit you keep your wish list short and simple.

You can find many at www.wineenthusiast.com. Search for them on the upper left under Wine Cellars. They also have an 800 number to call to get advice on what types to look at for your conditions, your collection, and your budget.